Device Allocation Based on Channel Path and Device Measurements
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
When a job is started in a multiprocessing system, I/O devices must be allocated to it for the data sets the job will use. In many cases, there is more than one device that could satisfy the requirements for a particular data set. For instance, temporary data sets can usually be placed on any of the direct-access storage devices by means of the currently available IBM system generation program known by the generic name SYSDA. The choice of a particular device for these allocations has an importance bearing on the delays the job will experience in accessing the data sets. Therefore, proper allocation requires an understanding of the current loading on the I/O subsystem.